Hoshizaki KM-501MAH, KM-501MRH, KM-501MWH service manual Removal and Replacement of Expansion Valve

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E. Removal and Replacement of Expansion Valve

IMPORTANT

Sometimes moisture in the refrigeration circuit exceeds the drier capacity and freezes up at the expansion valve. Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.

1)Turn off the power.

2)Remove the panels.

3)Recover the refrigerant and store it in an approved container.

4)Remove the insulation and the expansion valve bulb on the suction line.

5)Remove the expansion valve cover, and disconnect the expansion valve using brazing equipment.

6)Braze the new expansion valve with nitrogen gas flowing at the pressure of 3 to 4 PSIG.

WARNING

Always protect the valve body by using a damp cloth to prevent the valve from overheating. Do not braze with the valve body exceeding 250°F (121°C).

7)Install the new drier.

8)Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.

9)Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the charge label in the machine compartment.

10)Attach the expansion valve bulb to the suction line in the same location as the previous bulb. The bulb should be at the 12 o'clock position on the tube. Be sure to secure the bulb with the clamp and holder and to insulate it.

11)Place the expansion valve cover in position.

12)Replace the panels in their correct positions.

13)Turn on the power supply.

F.Removal and Replacement of Hot Gas Valve and Line Valve

IMPORTANT

1.Always use a copper tube of the same diameter and length when replacing the hot gas lines; otherwise the performance may be reduced.

2.Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.

3.Always replace the strainer when replacing the hot gas valve.

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Contents KM-501MAH KM-501MWH KM-501MRH Hoshizaki AMERICA, INC Contents Page Specifications Icemaker KM-501MAH air-cooledKM-501MWH water-cooled Water Cooled CondenserKM-501MRH remote air-cooled Condensing Unit URC-6FSpecifications II. General Information Construction KM-501MWH water-cooled KM-501MRH remote air-cooled Sequence of Operation Cycle Steps Harvest Cycle Freeze Cycle One Minute Control Board Control Board Control Products E Control BoardControl Board Layout Features Maximum Water Supply Period 6 minutesLED Lights and Audible Alarm Safeties Controls and Adjustments Default Dip Switch SettingsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Check Procedure Control Board ReplacementKM-501MAH air-cooled KM-501MWH water-cooled KM-501MRH remote air-cooled Wiring Diagrams KM-501MAH air-cooled and KM-501MWH water-cooledPsig Timing Chart Page Performance Data 245488 482 IV. Service Diagnosis Minute KM Diagnostic Procedure Diagnostic Charts No Ice ProductionProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Other Low Ice ProductionAbnormal Ice Problem Possible Cause Remedy Removal and Replacement of Components Service for Refrigerant LinesRefrigerant Recovery Evacuation and Recharge R-404ARemoval and Replacement of Compressor BrazingRemoval and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of Hot Gas Valve and Line ValveRemoval and Replacement of Evaporator Adjustment of Water Regulating Valve Water-Cooled Model Only Adjustment Screw CW Higher CCW Lower Top View Removal and Replacement of Thermistor Removal and Replacement of Pump Motor Removal and Replacement of Fan MotorRemoval and Replacement of Inlet Water Valve Removal and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Stainless Steel Exterior MaintenanceSanitizing Procedure Following Cleaning Procedure Preparing the Icemaker for Long Storage Storage Bin and ScoopAir Filters air-cooled models only Condenser air-cooled and remote air-cooled models only
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KM-501MAH, KM-501MWH, KM-501MRH specifications

The Hoshizaki KM-501MWH, KM-501MAH, and KM-501MRH are standout models in the commercial ice machine market, known for their robust performance and innovative technologies. These machines are specially designed to meet the diverse needs of restaurants, bars, and other food service establishments that require a reliable source of high-quality ice.

One of the defining features of the KM-501 series is their high production capacity. Each model can produce up to 500 pounds of ice per day, ensuring that even the busiest establishments can keep up with demand. The ice produced is crystal-clear, with a unique crescent shape that not only looks appealing but also melts slowly, making it ideal for drinks and food presentations.

The KM-501MWH model is equipped with advanced technology that ensures energy efficiency and reduced water usage. It features a powerful compressor and a highly efficient evaporator, which work together to minimize energy consumption while maximizing output. This makes it an environmentally friendly choice, reducing operational costs for businesses.

The KM-501MAH model stands out with its air-cooled condenser system, which allows for optimal performance without the need for extensive cooling water lines. This makes the installation process easier and reduces complexity, enabling businesses to set up their ice machine with minimal hassle. Furthermore, it features a self-cleaning mode that simplifies maintenance, contributing to consistent ice quality over time.

On the other hand, the KM-501MRH is designed for rugged environments. It is constructed with high-quality materials that enhance durability and longevity, making it suitable for outdoor applications or establishments located in warmer climates. The stainless-steel design not only contributes to the machine's robustness but also ensures easy cleaning and resistance to rust and corrosion.

Another key characteristic of the Hoshizaki KM-501 models is their user-friendly control panel. These machines come with intuitive controls that allow operators to easily adjust settings and monitor performance. This feature is particularly useful for staff in busy kitchens, enabling them to focus on service without constant checks on ice production.

Overall, the Hoshizaki KM-501MWH, KM-501MAH, and KM-501MRH offer excellent performance, energy efficiency, and user-friendliness. Their combination of innovative technologies, durable design, and high output capacity make them exceptional choices for any establishment in need of reliable ice production. Whether for a bustling restaurant or a bar serving up cocktails, these machines deliver ice that consistently meets high standards.
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